Sifting apparatus.



PATBNTED MAY 19, 1903.

No. 728,482.- l

E. MAAG.

SIFTING APPARATUS.

APPLIUATION FILED 00T. 15. 1900.

no MODEL.

l o channels.

No. 'tad-isa.

l Patented May 179, 1903.y

OFFICE.

' ENRICO MAAG, oF ZURICH, SWITZERLAND;

s-IFTING APPARATUS.

SPECIFICATION forming part ofLettersiPatent No. 728,482,-d.ted.'May'19, 1903. l

` Application iiledOotober 15,1900. Serial No. 33,144.' (llorinodel.)V i

To a/Z whom/ it may concern.-

Be it known that I, ENRICO MAAG, a citizen of the Republic of Switzerland, residing atl2. Waisenhausgasse, Zurich, Switzerland, have 5 invented certain new and useful Improvements in Sitting Apparatus; and I do hereby declare the followingtobe afull, clear,and exact description of the invention, such as will enable others skilled-inthe art to which it apro pertains to make and use the same. l

The present invention relates to sifting apparatus in which there are used plane sieves with parallel circular movement; and it consists in the addition of certain slats arrangedv in the channels of the sieve,the said' slats be-v ing adjustable and having Athe purpose of causing the material which ,is being sifted upon the sieve to be vretained for a longer orl shorter period, according to their adjust- 2o ment-that is to say, of enabling the material.

. to be sifted more or lessfinelyor perfectly.

Figure l illustrates diagrammatically in plan view a sieve embodying my-invention and the direction of feed of the material being sifted. Fig. 2 isa transverse sectional view of the construction shown in Fig. l. Figs. 3 and 4 are views similar to Figs. l and 2, the construction shown and the direction ofmovement of the` sifting material being modified. Figs. 5 and 6 are views also similar to Figs. l and 2, the construction and movement of the material being still further modified. Figs. 7 and 8 are fragmentary detail views, on an enlarged scale, representing, respectively, in plan and transverse sectional views one ofthe slats and its immediate connections. Figs. 9, 10,' and llare fragmentary detail views, on an enlarged scale, representing, respectively,'in plan and transverse sectional views one of the ,slats as illustrated in Figs. 5 and 6 and its immediate connections. Y Like letters of reference mark similar parts Wherever they occur in the several figures of the drawings.

I will now particularly describe the -construction and operation of myinvention, referring to the drawings by letters of reference..

Theplane sieve represented-in Figs. l and 9 is divided by a partition a into two sieve- At either side of the said partition ct slats b, moving on pivots placed at right angles to the face of the sieve, are provided. The slats o on either side of the parvg and h of the sieve. p resented in Figs. `5 and 6 the said slats b are tition a are interconnected by means of any suitable connecting means c and can by turning the nuts e of the screws articulated to "the slats b at one end of either set, be adjusted at'any angle to the partition a.

In orderA that after unscrewing the nuts e `the slats b may automatically reassume their original position ,one end of the helical springs f is attached to each of the other end slats 19,

` the other ends ofi-the saidspringslbeing fas- Y In the plane sieve reptened tothe sieve. resented in Figs. 3and tthe adjustable slats b are placed on the insides of the outer walls In the plane sieve rep- Lplaced on bars z', running parallel to the outer walls g and h of the sieve.

The effect of the adjustable slats b upon the sieve material being sifted is indicated in Figs. l, 3, and rby trajectory curves. It is 4 assumed that the sieves have la circular Inotion in the direction opposite to that of the j hands of a clock.

If the slats b are adj usted in such a manner as to form right angles with the walls of the sieve to which they are attached, the loop of the curves isnarrow. If they form, however, acute andobtuse angles, respectively, the loops of the curves become wider, and consequentlythe passage of the material over the surface of the sieve is retarded, Fig. 3. By suitably adjusting the slats it is therefore possible to retain the material upon the sieve for a longer or shorter period, and therefore to sift 'the said material more or loss finely or perfectly.-

Having thus described my invention, what I claim as new, and desire to'secureby Letters Patent of the United States, is;

A plane sieve provided with longitudinal channelsa series of interconnected parallel slats secu red pivotally to the walls of the sievechannels and projecting into said channels transversely to the path of the sifting material, -means for adjusting the Vseries in one direction, and a spring for returning the series in the opposite direction whenreleased, substantially as described.

f In testimony whereof- I-afx my sign'afture in presence of two witnesses.

ENRICO MAAG.

Witnesses:

A. LIEBERKNECHT, G. BILLIAN, Fils.

ICC 

